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Open AccessArticle

Archaeal Viruses Multiply: Temporal Screening in a Solar Saltern

Department of Biosciences and Institute of Biotechnology, University of Helsinki, Viikinkaari 5, 00014 Helsinki, Finland
Author to whom correspondence should be addressed.
Present address: Molecular Genetics, Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen, Linnaeusborg, Nijenborgh 7, Groningen 9747 AG, The Netherlands
Academic Editor: Rob Lavigne
Viruses 2015, 7(4), 1902-1926;
Received: 28 January 2015 / Revised: 16 March 2015 / Accepted: 31 March 2015 / Published: 10 April 2015
(This article belongs to the Section Bacterial Viruses)
Hypersaline environments around the world are dominated by archaea and their viruses. To date, very little is known about these viruses and their interaction with the host strains when compared to bacterial and eukaryotic viruses. We performed the first culture-dependent temporal screening of haloarchaeal viruses and their hosts in the saltern of Samut Sakhon, Thailand, during two subsequent years (2009, 2010). Altogether we obtained 36 haloarchaeal virus isolates and 36 archaeal strains, significantly increasing the number of known archaeal virus isolates. Interestingly, the morphological distribution of our temporal isolates (head-tailed, pleomorphic, and icosahedral membrane-containing viruses) was similar to the outcome of our previous spatial survey supporting the observations of a global resemblance of halophilic microorganisms and their viruses. Myoviruses represented the most abundant virus morphotype with strikingly broad host ranges. The other viral morphotypes (siphoviruses, as well as pleomorphic and icosahedral internal membrane-containing viruses) were more host-specific. We also identified a group of Halorubrum strains highly susceptible to numerous different viruses (up to 26). This high virus sensitivity, the abundance of broad host range viruses, and the maintenance of infectivity over a period of one year suggest constant interplay of halophilic microorganisms and their viruses within an extreme environment. View Full-Text
Keywords: halovirus; halophilic; archaea; hypersaline; Halorubrum; head-tail virus; virus-host interaction; virus morphotype halovirus; halophilic; archaea; hypersaline; Halorubrum; head-tail virus; virus-host interaction; virus morphotype
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Atanasova, N.S.; Demina, T.A.; Buivydas, A.; Bamford, D.H.; Oksanen, H.M. Archaeal Viruses Multiply: Temporal Screening in a Solar Saltern. Viruses 2015, 7, 1902-1926.

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